US4378728A - Coating booth for electrostatic application of pulverized materials - Google Patents

Coating booth for electrostatic application of pulverized materials Download PDF

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Publication number
US4378728A
US4378728A US06/149,589 US14958980A US4378728A US 4378728 A US4378728 A US 4378728A US 14958980 A US14958980 A US 14958980A US 4378728 A US4378728 A US 4378728A
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US
United States
Prior art keywords
booth
powder
vertical wall
clean air
filter module
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US06/149,589
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English (en)
Inventor
Adolf Berkmann
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nordson Corp
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Nordson Corp
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Publication date
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B14/00—Arrangements for collecting, re-using or eliminating excess spraying material
    • B05B14/40—Arrangements for collecting, re-using or eliminating excess spraying material for use in spray booths
    • B05B14/48—Arrangements for collecting, re-using or eliminating excess spraying material for use in spray booths specially adapted for particulate material
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S118/00—Coating apparatus
    • Y10S118/07—Hoods
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S55/00—Gas separation
    • Y10S55/46—Spray booths

Definitions

  • the invention relates to a coating booth for electrostatic application of pulverized or powder materials, especially paint on workpieces in which the powder particles not remaining clinging to the workpieces are carried out in an air flow produced by means of a suction device entering through an inlet in the coating booth and extracted from an outlet.
  • the object of this invention is to considerably shorten the necessary cleaning time when changing the coating powder.
  • This problem is solved according to the invention in that the coating booth has a basically tubular form and a boundary wall which, at least in the flow area from the inlet to the outlet, is formed fundamentally as part of a radius of a circle which smoothly blends into a bottom flat floor of the booth extending in the direction of the outlet.
  • This arrangement enables the particles not clinging to the workpiece to be carried along in a flow which passes in the area of the boundary wall between the inlet and the outlet without noteworthy turbulence, as there are no edges or corners but the boundary wall is formed to favor the flow so that no deposits of particles can form in this area.
  • the boundary has a smooth surface, it is easy to clean the clinging particles due to the electrostatic charge from this wall.
  • a particularly preferred embodiment of the coating booth according to the invention is that the cross section located in the plane of air flow is formed by the coating booth in a generally circular, elliptic or spiral-shaped fashion, which spirals terminate in a flat floor extending rearwardly and slightly downwardly in the direction of the outlet.
  • This constant uninterrupted boundary wall which replaces the former ceilings, floors and side boundary walls can be scraped with an appropriate sized scraper or wiper and thus be cleaned in a short time.
  • the only corners which remain in this coating booth are those which occur between the rotating boundary wall and the front walls, but these corners are not in the flow area so that no turbulence phenomena can appear here which lead to great deposits as is the case behind broken edges in a flow area.
  • the air flow outlet from the booth runs over the total length of the coating booth diagonally to the flow direction of the air so that the air flow is equally divided at a controlled velocity over the whole width of the boundary wall; due to this control only an extremely thin coat consisting of the powder used is obtained as a deposit on the floor of the booth and this deposit can be easily removed with a scraper.
  • This construction is preferred in short coating booths whose length is basically one-to-one and a half times the dimension of the greatest diameter of the booth.
  • These relatively short chambers when constructed with the generally circular or oval cross section of the booth, have a relatively small upper surface on which accordingly little coating powder can remain clinging. Therefore, the time necessary for the cleaning process is reduced.
  • the inventive booth of this invention includes a removable filter module sealingly connected to the air/powder outlet of the booth and the suction fan module of the booth. Consequently, to change from one powder to another, the filters may be quickly changed by simply wheeling one filter module away and sliding another into place at the back of the powder spray booth. There is consequently no down-time of the booth required to either clean the filters or to change the individual filters as has heretofore been the practice.
  • filters of powder spray systems are bag type filters through which a vacuum is drawn to pull the powder into contact with the surface of the filter.
  • the filters are cleaned by shaking or vibrating them to shake the collected powder from the outside surface of the bag.
  • the invention of this application improves upon the speed with which the bags may be cleaned by utilizing a square wave shaped perforated plate on the interior of each bag.
  • Still another aspect of this invention resides in the improved filter module in which one side is formed by a hinged gate to provide pressure relief in the event of a fire.
  • the filter media have been maintained in a confined area with the result that if a fire ever occurred in the filter area, the filter compartment exploded.
  • This invention has rendered the filter compartment explosion-proof by hinging one side open downwardly so that it is free to move outwardly in the event of a fire and a sudden expansion of gases within the compartment.
  • Still another aspect of this invention resides in the provision of the suction fan module attached to the rear of the spray booth.
  • This construction enables the filter module to be changed without having to change the fan module. It also has the advantage of eliminating ductwork between the booth, the filter module, and the fan module. Elimination of this ductwork eliminates the cost of the ductwork, the explosion hazard created by closed ductwork, and enables a smaller capacity blower motor to operate the suction fan system.
  • the invention also relates to a coating unit which is characterized by a row of several coating booths according to the invention, whereby the coating booths are arranged directly behind one another and laterally reversed so that inlets and outlets of adjacent coating booths alternate with one another, i.e., that the spray units and suction units or recovery units of adjacent booths of the row alternate with one another from booth to booth.
  • FIG. 1 is a cross sectional view of a coating booth incorporating the invention of this application.
  • FIG. 1A is a side elevational view of an auxiliary filter module for use in the coating booth.
  • FIG. 2 is a top plan view of the coating booth of FIG. 1.
  • FIG. 3 is a cross sectional view through one of the bag filters employed in the coating booth of FIG. 1.
  • FIG. 4 is a diagrammatic representation of a coating unit consisting of several coating booths connected behind one another.
  • a coating booth 1 is formed of a basically tubular shape and has end walls 2 and a casing type boundary wall 3 between the ends.
  • the coating booth 1 is supported on feet 4.
  • the coating booth 1 has a longitudinal slot 5 which extends for the length of the booth and through the end walls 2. This slot 5 extends downwardly and connects with an opening 6 in the end walls lying opposite one another. Through the slot 5, a holding device 7 grips a continuous conveyor 8 which is used to transport the workpieces 9 through the booth and through the openings 6 in the end walls.
  • the boundary wall 3 has an inlet 10 in the form of a window on one side through which an air stream, produced by the suction effect of a suction device 11, enters the coating booth and leaves it through an outlet 12 which extends for the full width of the booth.
  • This outlet 12 is sized relative to suction fan 11 so that an air flow velocity of between 100 ft/min. and 200 ft./min. is maintained through the outlet when the fan 11 is operative.
  • An air flow velocity below 100 ft./min. through the outlet 12 has been found to be insufficient to obtain the desired cleaning, sweeping action of the booth and a velocity above 200 ft./min. has been found to be destructive of the filter media contained within a filter module 13.
  • the filter module 13 in the coating booth 1 is attached directly to the outlet 12.
  • This filter module which is used to separate the excess particles contained in the air flow, is mounted on rollers 14 so that it may be quickly interchanged with an auxiliary filter module in the event of a powder or color change as explained more fully hereinafter.
  • the air flow emerging from the filter device 13 passes upwardly into the suction fan model 11 which is fixedly mounted above the outlet 12 on the outer side of the boundary wall 3 in such a way that the filter module 13 fits exactly under the suction fan module 11.
  • the outlet 20 of the filter module 13 lies directly under and sealingly connects with the inlet of the suction fan module 11 in the operative position of the filter module 13 as shown in FIG. 1.
  • the operative filter module 13 is simply exchanged for another identical but clean filter module 13'.
  • the coating booth has a basically oval cross sectional configuration whereby the bottom and floor part of the boundary wall 3 which extends from the lower end 10' of the window inlet 10 to the lower edge 12' of the outlet 12 is formed in the shape of a spiral which extends in the direction of the outlet 12.
  • This part of the boundary wall is therefore formed so as to be smoothly curved from the front radiused section beneath the window opening 10 to the flat downwardly and rearwardly sloping bottom wall 3'.
  • the angle at which the floor slopes downwardly and rearwardly has been found to be critical to the successful practice of the invention and the avoidance of air flow disturbance within the booth (which disturbance results in excessive collection of powder on the floor 3').
  • the floor must slope rearwardly at an angle to the horizontal which is from 0° to 12°. If the angle is greater than 12°, the air flow separates from the bottom wall 3' and instead of sweeping it clean into the outlet 12, leaves a powder deposit on the floor, and if the floor extends upwardly, turbulence is created and deposits of powder are left.
  • the powders which are sprayed from a spray unit (in the represented example a spray gun 15) in the direction of the workpiece 9 to be coated, do not remain clinging to the boundary wall 3.
  • the excess particles directed upwards around the workpiece 9 are almost completely directed downwards to the outlet 12 without causing them to cling to the boundary wall 3.
  • the relatively small portion of particles which remain clinging to the wall in the form of an extremely thin layer, due to the discharge, can be easily removed from the smooth boundary wall 3 when changing the coating powder or the color.
  • FIG. 1A it will be seen that there is a filter module 13' interchangeable with the module 13 located at the booth in FIG. 1.
  • the filter module 13 is removed and the new module 13' substituted.
  • Both filter module 13, 13' have a seal 21 which extends around the periphery of one side of the filter module and forms a seal between that side of the filter module and an opening 22 in the rear boundary wall 3.
  • the rear boundary wall of the booth is in part formed on the side 23 of the filter module. This portion of the boundary wall formed by the wall 23 extends downwardly from the seal 21 to the top edge 25 of the outlet opening 12.
  • the wall 23 is suspended from a hinge 24 such that it is free to move outwardly to the phantom position illustrated in FIG. 1.
  • the filter containing section of the module 13 is free to expand in volume because of the side 23 being free to spring inwardly into the booth.
  • each bag includes a square wave shaped perforated metal plate 30 over which the bag is stretched. In practice, cleaning of the bags occurs when the fan is turned off. At the time the bags are shaken or vibrated so as to cause excess powder previously entrapped on the surface of the bags to fall downwardly into a collection chamber 31.
  • the filter chamber 31 is a fluidized bed from which powder is removed and recycled via an air and powder flow line 32. Powder from the fluidized bed moves through line 32 to the feed hopper which in turn is operative to feed the electrostatic spray gun 15.
  • powder is sprayed from the spray gun onto the surface of the workpieces 9 as the workpieces are conveyed through the booth.
  • Excessive powder which does not adhere to the workpieces is caused by the suction fan module to be pulled through the booth into the booth outlet 12 from whence the powder either falls out into the fluidized bed 31 or is entrapped on the surface of the filter bags 29.
  • the suction fan module 11 is turned off and there is no vacuum being drawn on the bags, the bags are shaken or vibrated so as to cause powder adhered to the surface of the bags to fall down into the fluidized bed 31 and be recycled to the feed hopper.
  • the vacuum module 11 When a powder change is desired, as for example upon a change of color, the vacuum module 11 is turned off, the filter module 13 removed, and a new filter module 13' substituted for the original module 13 after cleaning of the interior surface of the booth. Because the booth is maintained relatively clean of powder, sweeping of the surface takes only a few minutes. After replacement of the new powder in the feed hopper, the clean booth is ready to be started with the new powder.

Landscapes

  • Details Or Accessories Of Spraying Plant Or Apparatus (AREA)
  • Electrostatic Spraying Apparatus (AREA)
  • Agricultural Chemicals And Associated Chemicals (AREA)
US06/149,589 1978-03-02 1980-05-14 Coating booth for electrostatic application of pulverized materials Expired - Lifetime US4378728A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE2809020A DE2809020B2 (de) 1978-03-02 1978-03-02 Beschichtungskabine für das elektrostatische Auftragen von pulverförmigen Stoffen
DE2809020 1978-03-02

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
US06/017,879 Division US4245551A (en) 1979-03-05 1979-03-05 Coating booth for electrostatic application of pulverized materials

Publications (1)

Publication Number Publication Date
US4378728A true US4378728A (en) 1983-04-05

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Family Applications (1)

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US06/149,589 Expired - Lifetime US4378728A (en) 1978-03-02 1980-05-14 Coating booth for electrostatic application of pulverized materials

Country Status (24)

Country Link
US (1) US4378728A (de)
JP (1) JPS54160443A (de)
AR (1) AR222322A1 (de)
AT (1) AT359616B (de)
BR (1) BR7901264A (de)
CA (1) CA1126010A (de)
CH (1) CH638698A5 (de)
CS (1) CS222240B2 (de)
DD (1) DD142155A5 (de)
DE (1) DE2809020B2 (de)
DK (1) DK30479A (de)
ES (1) ES475307A1 (de)
FR (1) FR2418679A1 (de)
GB (1) GB2015383B (de)
GR (1) GR74447B (de)
HU (1) HU179417B (de)
IN (1) IN150788B (de)
IT (1) IT1048448B (de)
NO (1) NO790686L (de)
PL (1) PL114418B1 (de)
PT (1) PT69000A (de)
SE (1) SE7813169L (de)
SU (1) SU904507A3 (de)
YU (1) YU51779A (de)

Cited By (49)

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US4498913A (en) * 1983-10-06 1985-02-12 Nordson Corporation Apparatus for filtering air for a powder spray booth
US4504292A (en) * 1982-08-10 1985-03-12 Esb Elektrostatische Spruh- Und Beschichtungsanlagen G.F. Vohringer Gmbh Powder spray booth
US4512281A (en) * 1982-09-03 1985-04-23 Sumitomo Electric Industries, Ltd. Method for coating optical transmission glass fibers
US4590884A (en) * 1985-05-09 1986-05-27 Nordson Corporation Portable powder spray system
EP0184994A1 (de) * 1984-09-26 1986-06-18 Siegfried Frei Pulverabsaugvorrichtung
US4662309A (en) * 1986-04-22 1987-05-05 Nordson Corporation Portable powder spray booth
US4704953A (en) * 1986-11-12 1987-11-10 Nordson Corporation Powder spray system
US4715314A (en) * 1985-04-30 1987-12-29 H. U. Ramseier Electrostatic powder coating installation
US4723505A (en) * 1986-03-17 1988-02-09 Nordson Corporation Powder booth
US4729340A (en) * 1984-04-30 1988-03-08 Zeiss James F Method and apparatus for powder coating elongated objects
US4730647A (en) * 1986-12-08 1988-03-15 Nordson Corporation Powder feeder apparatus
US4859266A (en) * 1986-02-10 1989-08-22 Nordson Corporation Method and apparatus for electrostatic powder sewing of fabrics
US4881952A (en) * 1984-05-16 1989-11-21 Stanley Electric Co., Ltd. Method and apparatus for disposing dust produced during amorphous silicon film-forming process
US4910047A (en) * 1988-08-11 1990-03-20 Nordson Corporation Apparatus for cleaning cartridge filters in a powder spray system
US4928624A (en) * 1987-02-09 1990-05-29 Overton Jr Duncan E Powder spray booth with overspray collection system
US5107756A (en) * 1991-01-11 1992-04-28 Reclaim Spray booth with alternative filtering systems
US5115760A (en) * 1989-04-01 1992-05-26 Brother Kogyo Kabushiki Kaisha Developer material coating apparatus having developer material removing unit
US5171368A (en) * 1991-07-02 1992-12-15 Russell Mazakas Filter belt assembly for a powder spray booth
US5199989A (en) * 1991-07-31 1993-04-06 Ransburg Corporation Powder booth floor wiping mechanism
US5259879A (en) * 1991-06-27 1993-11-09 Ransburg Corporation Powder application booth liner and method of making it
US5306332A (en) * 1991-05-14 1994-04-26 Air-Gonomics, Inc. Columnar filtering unit for spray painting
US5512100A (en) * 1993-02-17 1996-04-30 Nordson Corporation Powder spray booth with multiple filter modules
US5743958A (en) * 1993-05-25 1998-04-28 Nordson Corporation Vehicle powder coating system
US5851248A (en) * 1992-10-02 1998-12-22 Nordson Corporation Filter cartridge assembly for powder coating booth and collection system
US6080217A (en) * 1997-05-13 2000-06-27 Wagner International Ag Device for separating excess powder oversprayed when powder coating workpieces
US6143048A (en) * 1997-02-06 2000-11-07 Northrop Grumman Corporation Portable air pollution capture apparatus with painting tray
US6264745B1 (en) * 1999-06-14 2001-07-24 Wagner Systems, Inc. Powder spray apparatus
US6458209B1 (en) 2000-04-14 2002-10-01 Nordson Corporation Powder coating booth containment structure
US20020157604A1 (en) * 1997-09-05 2002-10-31 James Ainsworth Powder spray coating
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US20030077385A1 (en) * 2000-03-31 2003-04-24 James Ainsworth Powder coating systems
US6569217B1 (en) 2000-05-10 2003-05-27 Thomas M. DeMarco Industrial dust collector with multiple filter compartments
US6607573B1 (en) 1997-02-06 2003-08-19 Northrop Grumman Corporation Portable air pollution control apparatus
US20040074987A1 (en) * 2001-01-31 2004-04-22 Shutic Jeffrey R. Apparatus and method for automatic powder spray booth cleaning
US6730169B2 (en) 2000-08-22 2004-05-04 Nordson Corporation Electrostatic power coating system
US20040137144A1 (en) * 1993-05-25 2004-07-15 Shutic Jeffrey R. Vehicle powder coating system
US20050274094A1 (en) * 2003-03-17 2005-12-15 Demarco Thomas M Vacuum loader
US7074274B1 (en) 1999-09-17 2006-07-11 Nordson Corporation Quick color change powder coating system
US20060207230A1 (en) * 2003-03-17 2006-09-21 Demarco Maxvac Corporation Vacuum loader with filter doors
CN100417453C (zh) * 2003-11-20 2008-09-10 日本巴卡莱近估股份有限公司 粉体涂装***
US20110091655A1 (en) * 2008-04-16 2011-04-21 Peter Parling Method and apparatus for impregnation of items
US20130259758A1 (en) * 2010-09-10 2013-10-03 Herding Gmbh Filtertechnik Filter device and filter method
US8756827B1 (en) * 2011-05-12 2014-06-24 The Paint Booth Guys, Inc. Spray booth system and methods
CN103920613A (zh) * 2014-03-26 2014-07-16 蚌埠市高德机械自动化科技有限公司 一种全自动粉末回收再利用喷粉房装置
US20140366798A1 (en) * 2011-11-03 2014-12-18 Eisenmann Ag Filter module and device for the separation of overspray, and plant having the same
CN107626505A (zh) * 2017-09-30 2018-01-26 中国联合工程公司 粉末静电喷涂流水线上喷粉室的泄爆抗爆结构及抗爆方法
IT201900000611A1 (it) * 2019-01-15 2020-07-15 Fabio Gecchele Depolveratore, in particolare per macchine per la lavorazione di pelli, tessuti e simili.
US11312079B2 (en) * 2017-07-20 2022-04-26 Hewlett-Packard Development Company, L.P. Build material recycling device of a three-dimensional (3D) printer
EP3880336A4 (de) * 2018-11-15 2022-07-27 Fanca Technologies Pty Ltd Staubextraktionsvorrichtung

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IN150788B (de) 1982-12-18
PL114418B1 (en) 1981-01-31
CA1126010A (en) 1982-06-22
AR222322A1 (es) 1981-05-15
CH638698A5 (de) 1983-10-14
BR7901264A (pt) 1979-10-09
ATA521778A (de) 1980-04-15
DD142155A5 (de) 1980-06-11
FR2418679B1 (de) 1984-04-13
JPS54160443A (en) 1979-12-19
FR2418679A1 (fr) 1979-09-28
CS222240B2 (en) 1983-05-27
SU904507A3 (ru) 1982-02-07
IT1048448B (it) 1980-11-20
IT7824427A0 (it) 1978-06-12
DE2809020A1 (de) 1979-09-06
JPS6211629B2 (de) 1987-03-13
SE7813169L (sv) 1979-09-03
GR74447B (de) 1984-06-28
AT359616B (de) 1980-11-25
PT69000A (de) 1979-01-01
GB2015383A (en) 1979-09-12
GB2015383B (en) 1983-01-12
DE2809020B2 (de) 1980-08-28
DK30479A (da) 1979-09-03
YU51779A (en) 1982-08-31
PL213821A1 (de) 1979-11-05
NO790686L (no) 1979-09-04
ES475307A1 (es) 1979-04-01
HU179417B (en) 1982-10-28

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